It is now possible to hear what Mona Lisa's voice would have sounded like.

The Mona Lisa's smile may always remain a mystery, but it is now possible to hear what her voice would have sounded like, thanks to a Japanese acoustics expert.

Dr Matsumi Suzuki, who generally uses his skills to help with criminal investigations, measured the face and hands of Leonardo da Vinci's famous 16th century portrait to estimate her height at 168cm and create a model of her skull.

"Once we have that, we can create a voice very similar to that of the person concerned," Suzuki said in an interview at his Tokyo office.

"We have recreated the voices of a lot of famous people that were very close to the real thing and have been used in film dubbing."

The chart of any individual's voice, known as a voice print, is unique to that person and Suzuki says he believes he has achieved 90 per cent accuracy in recreating the quality of the enigmatic woman's speaking tone.

"I am the Mona Lisa. My true identity is shrouded in mystery," the portrait proclaims on a website at http://promotion.msn.co.jp/davinci/voice.htm

"In Mona Lisa's case, the lower part of her face is quite wide and her chin is pointed," Suzuki said.